Controller for electric motordriven traveling devices



Feb. 22, 1949. E. u. LASSEN 294625755 CONTROLLER FOR ELECTRIC MOTOR DRIVEN TRAVELING DEVICES Original Filed Aug. 13, 1943 2 Sheets-Sheet l [El I4 FLOOR '3 /3 FLOOR z FLOOR 1 1949. E. u. LASSEN 2462755 CONTROLLER FOR ELECTRIC MOTOR DRIVEN TRAVELING DEVICES 1 Original Filed Aug. 13, 1943 2 Sheets-Sheet 2 4 5.24 Z526 a9? 50 L4BI/5B 5 El DO U 59 55 Enigma 5 O 2 T Patented Feb. 22, 19 59 UNITED STA'l'lEd Substituted for application Serial No. 498,537,

FFICE August 13, 1943. This application August 12, 1944, Serial No. 549,258

(Cl. Mill-29) 29 Claims. 1

The present invention relates to control for electric motor driven traveling devices and is particularly applicable to and advantageous for control of elevators and other traveling devices.

The present application more particularly relates to modifications of the system disclosed in the Seeger Patent .,36-S,333, filed June 17, 19 3, and is a substitute for applicants prior application, Serial No. 498,537, filed August 13, 1943, and since abandoned, for Controllers for motor driven traveling devices; Cutler-Hammer, Inc., of Milwaukee, Wisconsin, being the assignee of both applications.

Where it is desired to start and stop traveling devices, such as elevators, from various landings as by push button switches with registration of a plurality of calls for automatic stopping of the elevator car at the landings, the calls are set up in such a manner that the traveling device stops in succession at the various landings for which push buttons have been operated in the natural order of such landings. This requires that the traveling device completes its travel in a given direction before reverses to respond to push buttons which have been operated calling upon the car to travel in the opposite direction. It has been found necessary heretofore to provide costly and complicated means and circuits to effeet the desired automatic starting and stopping.

The present invention has among its objects to provide suitable control for elevators and other traveling devices aiiording the aforediscussed and other features with simplification of the control apparatus and of the control circuits.

Another object is to provide a control system of the aforementioned character which requires a minimum of electromagnetic switching appsratus.

Another object is to provide a system which employs a control panel containing the electromagnetic control devices the assembly and wiring of which is independent of the number of floors served.

Another object is to provide a control system in which electric energy is stored up as an incident to actuation of a push button switch for start ing and for registering a call at a given landing, and in which the stored energy is discharged upon entry of the device into a given zone of travel from a given direction, to efiect stoppage of the device.

Another object is to provide a control system including electromagnetic means which are energized to start the device and including means for storing up energy upon registering a call and Z discharging said stored energy to ultimately deenergize said electromagnetic means for stopping upon the device approaching the desired landing in the desired direction.

Other objects and advantages will appear from the following description and claims.

accompanying drawing is illustrative of a system embodying the invention.

In the drawing,

Figure 1 is a general representation of an elevator installation including the elevator car with its driving motor and their general relation to the several elements of the control system.

Fig. 2 is a circuit diagram of the control circuits of the system, and

Fig. 3 is a chart of the electromagnetic switches and relays of Fig. 2, said chart having the coordinated windings and contacts horizontally aligned with the corresponding elements in Fig. 2.

Referring to Fig. 1 of the drawings, the same illustrates an elevator for four floors having a car i which is operated by a reversible direct current shunt Wound motor 2, the latter having an armature 2 and a shunt field winding 2*. The motor and the control circuits are supplied with energy from the direct current lines L L The energy supplied to the motor is controlled through an electromagnetic main switch 24 and a pair of electromagnetic reversing switches 4 and 5. The main switch 2 1 is provided with an energizing winding 2%, normally open main contacts M and as shown in Fig. 3 normally open auxiliary contacts 24, 24 and a delayed action normally open contact 2 3 The electromagnetic switch i is designed to effect operation of the elevator in an upward direction and is provided with an energizing Winding l normally open main contacts l and 4, and as shown in Fig. 3 with normally open auxiliary contacts 4 4 4 and t and normally closed auxiliary contacts i The electromagnetic switch 5 efiects operation of the elevator in a downward direction and is provided with an energizing winding 5 normally open main contacts 5 and 5, and as shown Fig. 3 with normally open auxiliary contacts 5 5 and 5 and normally closed auxiliary contacts 5 The elevator car is connected with the motor armature by means of ropes or cables connected to a pulley which is mounted on the motor shaft. Also mounted on the motor shaft is an electromagnetic brake 32, having an energizing winding 32 which when energized releases the brake. Also connected to the car by means of a rope and counterweight so as to move in synchronism With the car is a sheave wheel E. On its shaft is mounted a rotating floor selector 8 having two substantially semicircular contact segments 8 and 8 which are insulated from one another. The sheave l is arranged so that the floor selector makes substantially one-half revolution during the travel of the elevator car from the lowest to the highest limit, The segments 8 and 2 are provided with contact brushes 8 and 8 Each of said brushes is at all times in engagement with one of the segments to conduct current thereto. Additional contact brushes 8 to 8 inclusive, cor-- responding in number to the number of floors, are arranged about the left-hand portion of the circumference of selector ii between the brushes 8' and li to make contact with one or the other of the segments 8 8 depending upon the position of the car in the hatchway. The sheave i also drives traveling nut selector switches Q, H3 and ll. The selector switch 9 has a bridging contact S which makes contact with a contact segment 9 and with contact buttons 9 to 9 se1ectively. Each of the contact buttons to s cor responds to one of the floors of the elevator. Similarly the selector switches iii and l l are provided with bridging contacts H3 and M respectively, contact segments iB li respectively, and con" tact buttons W to and H to E i respectively.

Mounted at the various fioors are push button stations I2 to 15, inclusive, adapted to initiate starting of the elevator. The push button etations l2 and P5 are mounted at the first and last floors, respectively, and are single push button stations provided with triple normally open contacts. The push button stations 53 and it mounted at the second and third floors, respectively, are each provided with two triple contact normally open push button switches, one push button switch of each pair being operable for stopping on downward movement and the other being operable for stopping on upward movement of the car, and each providing for starting or the car when at rest. Floor hatchway limit switches l6 to I9, inclusive, are mounted in the hatchway, being spaced correspondingly to the spacing of the floors. These hatchway switches are provided with normally closed contacts and are operable to the open position by means of a retiring cam 34, mounted on the car and having an energizing winding 34 When the winding 3 is deenergized the retiring cam moves into cooperating relationship to the limit switches it to H3, so as to open each as the car approaches the respective landing and to maintain each open as long as the retiring cam winding is deenergized, and the car is at the respective landing.

There are also installed in the hatchway near the lowermost and uppermost limits of travel, normally open stop limit switches 35) and 3i, respectively, operable respectively by cams 30 and. 3| on the car. Double pole normally closed limit switches 21 and 28 are mounted in the hatchway, being respectively provided with two normally closed contacts 21 2l and 28 28 these contacts being opened by abutment of the elevator car with the respective limit switch upon arrival of the car at the respective lower and upper limits of travel.

As shown in Figs. 2 and 3 the control panel is further equipped with an up relay 25 and a down relay 26, having electromagnetic Windings 25 and 25 respectively, and normally open contacts 25 and 25 and 25 and 25 respectively. The controller further includes a stop relay 29, having energizing windings 29 29 and 29, and

normally open contacts 29, 29 and said controller also includes a retiring cam relay 33, having an energizing winding 33*, normally open contacts 33 and normally closed contacts 33.

Mounted in the elevator car are normally open triple contact push button switches 2Q to 23, inclusive, one for each floor.

Connected between one contact of each of the push button switches ii to 55, inclusive, and the line L is one of a group of condensers 35 to do, inclusive, while similar condensers di and .2 are respectively connected between one contact of the push button switches 2i and 22 and line L The push button switches 26 and 22% are connected in parallel with push button switches 52 and ii respectively.

To provide for automatic reversal of the elevator under certain conditions, the system further includes two electron tubes 5i? each provided with a cathode 55 and respectively, an anode 5t and 5! respectively, and a control grid 50 and 5!, respectively. A resistor 52 is connected between the line L and the cathode 56 of tube 58, and another resistor 53 is con nected between the cathode 59 and the line L A resistor 56 has one terminal connected to the grid '56 and a resistor 55 is connected between the grid 58 and the line L The second terminal of the resistor 55 is connected, in series with a condenser 59 of relatively small capacity, to the segment 9 of the floor selector 9. The cathode SE is also connected to the brush 3 and contacts 25 while the anode 59 is adapted to be connected through contacts 24 to line L A resistor 57 is connected between the line L and the cath-. ode 53 of tube 55, and a resistor 53 is connected between the cathode fil and the line L One terminal of a resistor 55? is connected to the control grid 5! and a resistor 69 is connected be-- tween the control grid ii and the line L The second terminal of the resistor 59 is connected, in series with a condenser 5!, to the segment Ifi of the floor selector lil. The cathode fil is also connected to the brush 8 and contacts 25, while the anode 5 l is adapted to be connected through the contact 26 to the line L It will be seen. that when the tubes 59 and 5! are rendered c0nducting they afford paths from line L through contact 2 4 to parallel the contacts 25 25 respectively.

For simplicity the usual landing door switches, car door switch and other safety switches have been omitted from the drawing, but it will be understood that the use thereof in the usual manner is contemplated and it may be assumed that such switches are connected in series with the hatchway switches 55 to is.

The system is connected and operates as follows: Let it be assumed that the car is at the first landing and has discharged its passengers from the previous run and let it be further assumed that all of the circuits are deenergized. If now a passenger enters the car and wishes to go to the second floor, he actuates the push button switch 2!, which completes a circuit from line L through said push button switch, to the condenser 31 to line L and the condenser is charged to line potential and stores up electrical energy. A circuit is also completed from line L through the center contact of the push button switch 2! to contact brush 8 segment S to contact brush 8, through contacts 28 through energizing coil 25 to line L Thereupon the relay 25 is energized and it completes a maintaining circuit from line L over contacts 25*, 23 and coil 25 to line L so that the relay remains energized when the push button is released. A circuit is also completed from line L throuin contacts 25 5 to and through energ' g coil 4 contacts 28', to line L This energi up reversing switch which closes contacts 32 paralleling the contacts 25 and also prepares a circuit (Fig. 1) from line L tLrough contacts 4*, contacts 2 9, through the armature 2 through contacts 4 to L but the motor does not start, as switch 25 is still deenergized. Response of switch l closes contacts 4 to establish a circuit from line L through contacts 4 33 and coil 34 to line L to energize the retiring cam and permit closure of limit switch it. This closes a circuit from contacts 3 through energizing coil 24 through the hatchway limit switches Iii, ll, [8, [9 to line L Thereupon switch it responds and closes contacts 25 to complete the circuit through the motor armature. Contacts 2. also close and complete a circuit from line L over contacts 4 24, to and through energizing coll 32 to line L This lifts the brake 32 and the motor operates to move the car in an upward direction. The car now travels upward until the floor limit switches 9, iiLand II, respectively, bridge the contacts 9 and 9 lii and i lli and li whereupon a circuit is established from condenser 4! over contacts li ii and l U, through energizing coil Ze to line L and back to condenser 4|. The energy stored up in the condenser is thereby discharged through the energizing coil 29* of relay 29, causing the relay 29 to respond. This closes a circuit from line L through contacts i 29 2 energizing coil 33 to line L whereupon the relay responds to open the normally closed contacts 33, so that the energizing coil se of the retiring cam is deenergized. Thereupon the retiring cam moves into cooperative relationship to the hatchway limit switch l1 and opens the contacts thereof. This interrupts the energizing circuit of the coil 2% and the switch 2 3 disconnects the mot r armature from the line and also opens the c "-rgizing circuit of the brake coil 32 by opening contacts 2 and the brake stops the motor.

Response of relay 33 also closes normally open contacts 33 thereby paralleling the contact 2& of relay 29, so that the relay coil 33 is maintained energized for a limited time after dcenergizaticn of switch 24 by the contact 24, thus keeping the retiring cam coil St deenergized keeping the limit switch I? open to prevent restarting of the elevator and to permit discharge of the passenger. After a given time detern ined by the time element of the contacts 24 the relay coil 33 again deenergized, thereby reclosing contacts 33 and permitting energization of the retiring cam coil 34 It will be observed that the relay 25 and the reversing switch 4 after they have been closed remain energized until the car reaches its up limit, where their energizing circuits are interrupted by opening of the contacts and 28 respectively, the car being stopped at intermediate floors by opening of switch 2 in response to the push button control.

If during the aforesaid travel of the elevator or during its stoppage on the second floor push button l l has been depressed the condenser 39 is charged. As soon after stoppage at the second floor as the retiring cam coil se is again energized, the retiring cam is withdrawn and permits closure of limit switch IT, whereupon a circuit is again established from line L through contact 4 through energizing coil 24*, and the limit switches I 5 to is to line L This causes the motor to start again for travel of the car in the upward direction toward the h d landing. When the elevator reaches the th d landing a circuit is established from the revi usly charged condenser 39, over contacts 9 d 9*, through contacts 4, relay coil 29 to line L This energizes relay 2%! which causes closure of contacts Ed and stoppage of the elevator the manner aforedescribed.

After discharge of the passenger on the third floor the car continues to travel in the upward direction in the manner aforedescribed, until it reaches the uppermost landing, whereupon the contacts 28 and 28 of the limit switch 28 open. Opening of the contacts 28 deenergizes the up reversing switch while opening of contacts 28 opens the energizing circuit of the relay 25 and the elevator will come to a stop.

Just prior to actuation of limit switch 28, the limit switch 35 is closed by the cam 3t to close a circuit from line L through said switch 35 and contacts i coil 29, the floor switches F5 to l9, inclusive, to line L This causes relay 29 to respond to close contacts 28 thereby establishing a maintaining circuit for coil 29 in paral. lel with the limit switch contacts 3i and contacts 4 Response of relay 33 opens the contacts 33 thereby deenergizing coil 34 of the retiring cam 34 and said cam 34 causes opening of the contacts is and the elevator will remain at the top landing.

If now or previous to the stoppage of the car at the top landing any one of the push button switches, except that for the uppermost floor, is operated, the relay coil 25 is energized in a manner similar to that described in connection with the relay coil when the elevator was assumed to be on the first floor. This circuit extends from line L ,over the respective push button switch, for instance E3 or li brush 8 segment 8 brush 3 contacts 27 through relay coil 26 to line L This in turn prepares a circuit for energizing the coil 5* of the down reversing switch 5 through a circuit from line L over contacts 25 contacts i when engaged, coil 5*, contacts 27 to line L and the controller responds to start the elevator in the downward direction when the up switch drops out to reclose contacts 6 the relay 25 and the switch 5 performing similar to the relay 2% and the switch 4, but for reverse operation of the motor.

If the elevator is at the top fioor and an up push button switch on any landing, except the push button switch of the top floor, for instance, the second floor up push button switch I3", is depressed, a circuit is established from line L through said push button switch l3 contact brush 8 segment 3 brush 33 contacts 27*, relay coil 26 to line L The relay 26 closes the contacts 25 thereby completing a maintaining connection from line L through contact 26 to a point adjacent brush 8, thence through contacts 21*, through coil 26 to line L thus maintaining the relay 26 energized when the push button is released. A circuit is also established from line L over push button !3*, to condenser 31, to line L and the condenser is charged.

Response of relay closes contacts 26 thereby establishing a circuit from line L through contacts 25 contacts 4 energizing coil 5 contacts 21", to line L and the down reversing switch 5 is energized to set up a circuit for the armature to permit the motor to revolve in a downward direction. Response of the switch opens the contacts 5 which prevents the energization of the up reversing switch l. Response of switch 5 further completes a circuit from line L through contacts 5 energizing coil 24*, through the limit switches It to 19, inclusive, when all are closed, to line L and the main switch 2% is energized to complete the armature circuit for reverse operation of the motor to move the elevator car downwardly. Response of the down reversing switch 5, with consequent closure of contacts 5 completes a circuit from line L through contacts 5 contacts 33, through the retiring cam energizing coil 34*, to line L so that the retiring cam 34 is withdrawn and limit switch 19 is closed.

The elevator thus moves in a downward direction until it reaches the second floor, whereupon a circuit is established from the condenser 37, over contacts 9 9 9 to the condenser 56, through resistors 5&- and 55 to line L and back to the condenser 31. The condenser 3'! thusgives up a small amount of its charge to the condenser 56 and the grid 50 of the tube 56 is rendered suinciently positive with respect to the cathode 58 to make the tube conducting. This completes a circuit from line L through contacts 24 tube 56, contacts 28 coil 25 to line L Relay 25 is thereby energized and closes its maintaining contacts 25 When the elevator reaches the lowest floor and the opening of contacts 27 deenergizes relay 26, to open contacts 25, relay 25 remains energized. However, opening of contacts 21* opens the maintaining circuit of the down reversing switch 5, and the up reversing switch 4 is now energized by a circuit from line L through contacts 25 contacts 5 coil t and contacts 28 to line L and the elevator travels in an upward direction as described. If new the elevator reaches the second floor, the condensers 31 and 56 are discharged through the coil 29 of relay 29 and the relay deenergizes the main switch 24 as aforedescribed.

If, while the elevator is traveling upwardly, a down button, for instance, the button [4 is depressed the relay 26 is energized and the condenser 38 is charged as described. After stopping on the second floor the elevator will proceed to the third floor, and upon reaching the third floor the selector switch It will connect the condenser 38 to the condenser 6|, and make the tube 5i conducting and thereby pick up relay 2B which will maintain itself through contacts 26 Thus upon arriving at the upper limit the relay 25 and the reversing switch 4 are deenergized and the reversing switch 5 is energized to cause the elevator to operate again in a downward direction until the third floor is reached whereupon the condensers 38 and Bi discharge through the energizing coil 29 to bring the elevator to a stop.

If, while the elevator is moving in a downwardly direction a down button is operated at a floor which is above that at which the elevator is at the moment of the operation of the button, the elevator will continue on its downward travel as aforedescribed. Thereafter it will reverse at the lower limit, then move upwardly to the upper limit, and again reverse to travel downwardly until it reaches on its second downward travel the floor at which the down button has been operated, the operation under these conditions being apparent from the foregoing description.

The foregoing description shows that when while the car is traveling downwardly, following its reversal toanswer the first landing call, in-

termediate landing buttons are operated, the car will stop at the landings where down buttons have been operated and will pass those landings at which up buttons have been operated. Then when the car has reached the lowermost landing, it will reverse and answer the calls registered by the up buttons, making the stops in both directions in the natural order, regardless of the order in which the buttons have been operated. It is, of course, to be understood that this latter statement presupposes operation of each involved button in time to be effective without repetition of a complete cycle of the car.

On the other hand, the system also provides for repetition of a complete cycle of travel when necessary. For example, if the car has passed the second floor traveling upwardly, when the up button at the second floor is operated, said button when operated will initiate maintenance of its call while the car goes to its up limit and reverses and then goes to its down limit for a second reversal to answer the up call at the second floor on the upward travel of the car after said second reversal.

While the system described is provided with a direct current motor, the same may be used for the control of any other type of motor suitable for elevator drive.

The energy for the control circuits may be supplied from an alternating current source through a rectifier. It is also possible to energize only the condensers with direct current and all other circuits with alternating current. In that event, the push button switches must be suitably modified. Other modifications of the system within the scope of the present disclosure and the appended claims will be obvious to those skilled in the art.

I claim:

1. in control for an electric motor driven traveiing device, the combination with means to eiiect travel of the device through a plurality of zones, said means including a plurality of push button switches, at least one for each zone of travel served by the device and operable to start said device and direct it to the corresponding zone, of separate condenser type energy storing conneced circuit with said push button switches for charging of the former -from an energy source upon operation of said switches, electroresponsive means requiring energization for stopping said traveling device and responsive to discharge of any of said energy storing means, and means responsive to the movement of said traveling device to afford discharge or" said separate energy storing means which have been charged, in a predetermined order irrespective of the order of actuation of said push button switches, regardless of any temporary failure of the source of charging current, the first mentioned means including means which after each stop of said device as a function of discharge of said energy storing means affords under given conditions automatic restarting.

2. In control for an electric motor driven traveling device, the combination with means to efiect travel of the device through a plurality of zones, said means including a plurality of push button switches, at least one for each zone of travel served by the device, said push button switches being operable selectively to start said device and direct it to the .corresponding zone, of separate condenser type energy storing means connected in circuit with said push button switches for charging of the former from an energy source upon operation of said switches,

electroresponsive means requiring energization for stopping said traveling device and responsive to discharge of any of said energy storing eans, and means responsive to the movem at or" said traveling device to afford discharge of said separate storing means which been charged, in a predetermined order irrespective of the order of actuation of said push button switches, when said device enters the respective zone, regardless of any temporary failure of the source of charging current, the first mentioned means comprising means v nich after each stop effected by said energy storing means affords restarting automatically until all calls registered by said push button switches are answered.

3. In control for an electric motor driven traveling device, the combination with means to effect travel of the device in either direction through a plurality of zones, said means including a plurality of button switches, at least one for each zone of travel served by the device, said push button switches being operable selectively to start said device and direct it to the corresponding zone, of a plurality of condenser type energy storing means, means effective upon operation of one or more of said push button switches to store up electrical energy from an energy source in one or more of said energy storing means corresponding to the push button switch or switches operated, electroresponsive means requiring energization for stopping said traveling device and responsive to discharge of any of said energy storing means, and means responsive to the movement of said traveling device to aiiford discharge of said separate energy storing means which have been charged, in a predetermined order irrespective oi the order or" actuation of said push button switches, when said device enters the respective zone, regardless of temporary failure of the source of charging current, the first mentioned means including means affording automatic restarting and automatic reversals when needed to effect discharge of the charged condensers.

4. In a control for an electric motor driven traveling device, in combination, a reversible motor to efiect movement of the traveling device into a plurality of zones of travel, electromagnetic control means for said motor afiording starting thereof in opposite directions and including means requiring energization for stopping, a plurality of push button switches, at least one for each zone served by the device, said push button switches being operable selectively to effect starting of said device by said electromagnetic control means in reverse directions and directing said device to the corresponding zone, a plurality of condensers, means efiective upon operation of any of said push button switches to store up electrical energy in one or more of said condensers corresponding to the push button switch or switches operated, a zone type selector driven by said motor to afford connections from said condensers selectively to said stopping means to discharge the condensers selected thereby which have been charged, said selector so rendering he charged condensers effective in a predeterrn Jed order irrespective of the order of actuation or said push button switches, and means including another condenser coordinated with the aiorementioned condensers to eiiect automatic reversal of said device when needed to effect answer ing of all calls registered by said push button switches.

5. In a control for an electric motor driven traveling device, in combination, a reversible mot r tre corresponding zone, a plurality of condenses, means effective upon operation of any of said ush button switches to store up electrical to the push button switch or switches a zone type selector coupled to said motor to afford discharge 1 the energy stored in aid cc densers which have been charged to er"- ation of said stopping means, said t e T or so rendering the charged condensers efin a predetermined order irrespective of 'der of actuation of said push button ches, and means including other energy storns of the condenser type coordinated with 'orementioned condensers to provide for reof device at each terminal zone auto ly when one or more of the first mentioned cc ,densers has earlier been charged and requires such reverse travel of said device to effect discharge thereof.

6. In a control for an electric motor driven traveling device, in combination, a reversible motor to effect movement of the traveling device into plurality of zones of travel, electromagnetic control means for said motor affording starting thereof in opposite directions and including means requiring energization for stopping, a plurality of push button switches at least one for each zone served by the device, said push button switches being operable selectively to elTect starting of said device by said electromagnetic control means in opposite directions and directing said device the e to the corresponding zone, a plurality of condensers individual to said zones, means effective upon operation of any of said push button switches to store up electrical energy in one or more of said condensers corresponding to the push button switch or switches operated, commutating means coupled to said motor and connected in circuit with said push button switches to selectively control said electromagnetic control means, means to insure against reversal of the direction of travel of the device prior to arrival thereof at the most remote zone in the initial direction or" travel, and a zone type selector coupled to said motor to afford discharge of the energy stored in said condensers which have been charged effect energization of said stopping means, said selector so rendering the charged condensers effective in a predetermined order irrespective of the order or actuation of said push button switches.

7. In a control for an electric motor driven traveling car, in combination, a reversible motor to efie'ct movement or" the car into a plurality of zones of travel, electromagnetic control means for said motor affording starting thereof in opposite directions, and including means requiring energization for stopping, a plurality of push button swit hes at least one for each zone served by the device, said push button switches being operable selectively to effect starting of said car by said electromagnetic control means in opposite directions and directing said car to the corresponding zone, a plurality of condensers individual to said zones, means effective upon operation of any of said push button switches to store up electrical energy in one or more of said condensers corresponding to the push button switch or switches operated, commutating means coupled to said motor and connected in circuit with said push button switches to selectively control said electromagnetic control means, means to insure against reversal of the direction of travel of the car prior to arrival thereof at the most remote zone in the initial direction of travel, and a zone type selector coupled to said motor to afford discharge of the energy stored in said condensers which have been charged to effect energization of said stopping means, said selector so rendering the charged condensers effective in a predetermined order irrespective of the order'of actuation of said push button switches, the effectiveness of said condensers which have been charged prior to a temporary failure of power of said means being unaffected by such temporary failure.

8. In a selective collective control system for an elevator or other reversible traveling device, characterized by storing of energy for registration of calls and also by discharge of stored energy for stopping the traveling device automatically as each call is met, the combination with condenser type energy storing means to so function, of reversing means for the traveling device comprising additional condenser type energy storing means which is dependent upon the former energy storing means for charge and which when charged efiects operation of said reversing means, and means controlling said additional energy storing means automatically for charge thereof when but only when reversal of the traveling device is needed for response to a call registered by charge of the first mentioned energy storing means.

9. In a selective collective control system for an elevator or other reversible traveling device, characterized by storing of energy for registration of calls and also by discharge of stored energy for stopping the traveling device automatically as each call is met, the combination with condenser type energy storing means to so function, of reversing means for the traveling device comprising additional condenser type energy storing means which is dependent upon the former energy storing means for charge and which when charged effects operation of said reversing means, and means controlling said additional energy storing means automatically for charge thereof when but only when reversal of the traveling device is needed for response to a call registered by charge of the first mentioned energy storing means, said additional energy storing means discharging as an incident to reverse travel induced thereby, the energy stored therein to bring about the reversal.

10. In a selective collective control system for an elevator or other traveling device, characterized by storing of energy for registration of calls and also by discharge of stored energy for stopping of the traveling device automatically as each call is met, the combination with condenser type energy storing means to so function, of reversing means for the traveling device comprising additional condenser type energy storing means which when charged efiects operation of said reversing means, and means controlling said additional energy storing means automatically for charge thereof when but only when reversal of the traveling device is needed for response to a 12 call registered by a charge of the first mentioned energy storing means.

11. In a selective collective control system for eievator or other traveling device, characterized by storing of energy for registration of calls and also by discharge of stored energy for stopping of the traveling device automatically as each call is met, the combination with condenser type energy storing means to so function, of reversing means for the traveling device comprising additional condenser type energy storing means which when charged effects operation of said reversing means, and means controlling said additional energy storing means automatic-ally for charge thereof when but only when reversal of the traveling device is needed for response to a call registered by a charge of the first mentioned energy storing means, said additional energy storing means discharging as an incident to reverse travel induced thereby, the energy stored therein to bring about the reversal.

12. In a selective collective control system for an elevator or other traveling device, characterized by storing of energy for registration of calls and also by discharge of stored energy for stopping of the traveling device automatically as each call is met, the combination with condenser type energy storing means to so function, of reversing means for the traveling device comprising a pair of condensers which are chargeable selectively to effect different operations of said reversing means selectively, and means controlling said pair of condensers automatically for charge of each when but only when the reversal tobe effected thereby is needed for response to a call registered by a charge of the first mentioned energy storing means.

13. In a selective collective control system for an elevator or other traveling device, characterized by storing of energy for registration of calls andL also by discharge of stored energy for stopping of the traveling device automatically as each call is met, the combination with condenser type energy storing means to so function, of reversing means for the traveling device comprising a pair of condensers which are chargeable selectively to effect different operations of said reversing means selectively, and means controlling said pair of condensers automatically for charge of each when but only when the reversal to be effected thereby is needed for response to a call registered by a charge of the first mentioned energy storing means, each of said pair of condensers discharging as an incident to the reverse travel induced thereby, thus to avoid interference with further reversal for response to all calls registered.

14. In a selective collective control system for an elevator or other reversible traveling device, the combination with reversing means for the traveling device comprising condenser type energy storing means through the medium of which operation of said reversing means may be prearranged, and means controlling said energy storing automatically to so prearrange an operation of said reversing means when but only when reversal of the traveling device is required for response to a call registered.

15. In a selective collective control system for an elevator or other traveling device, characterized by storing energy for registration of calls and also by discharge of stored energy for stopping of the traveling device automatically as each call is met, the combination with energy storing means to so function, of reversing means for the traveling device comprising additional energy storing means and also electronic means under the control of said additional energy storing means, said electronic means and its controlling energy storing means affording means by which an operation of said reversing means may be prearranged, and means controlling said additional energy storing means automatically for so prearranging an operation of said reversing means When but only when reversal of the traveling tievice is needed for response to a call regist" by charge of the first mentioned energy storing means.

16. In a selective collective control system for an elevator or other reversible traveling device, characterized by mean responsive for registration of calls and for stopping the traveling device automatically as each call is met, the combination with registering means to so function, of reversing means for the traveling device comprising condenser type energy storing means which is dependent upon said registering means for charge and which when charged efiects operation of said reversing means, and means controlling said energy storing means automatically for charge thereof when but only when reversal of the traveling device is needed for response to a call registered by said registering means.

1'7. In a selective collective control system for an elevator or other reversible traveling device, characterized by means responsive for registration of calls and for stopping the traveling device automatically as each call is met, the combination with registering means to so function, of reversing means for the traveling device comprising condenser type energy storing means which is dependent upon said registering means for charge and which when charged effects operation of said reversing means, and means controlling said energy storing means automatically for charge thereof when but only when reversal of the traveling device is needed for response to a call registered by said registering means, said energy toring means discharging as an incident to reverse travel induced thereby, the energy stored therein to bring about the reversal.

18. In a selective collective control system for an elevator or other reversible traveling device, characterized by means responsive for registration of calls and for stopping the traveling device automatically as each call is met, the combination with registering means to so function, of reversing mean for the traveling device comprising dual condenser type energy storing means which are chargeable selectively to effect different operations of said reversing means selectively, and means controlling said dual energy storing means automatically for charge of each when but only when the reversal to be eiiected thereby is needed for response to a call registered by said registering means.

19. In a selective collective control system for an elevator or other reversible traveling device, characterized by means responsive for registration of calls and also for stopping the traveling d vice automatically as each call is met, the com- 1 ,tion registering means to so function, of reversing iii-cans for the traveling device comprising dual condens r type energy storing means which are charge ole selectively to effect different operations of said reversing means selectively, and means controlling said dual energy storing means automatically for charge of each when but only when the reversal to be effected thereby is needed for response to a call registered by said registering means, each of said dual energy stormeans discharging as an incident to the reverse travel induced thereby, thus to avoid interference with further reversal for response to all calls registered.

20. In a selective collective control system for an elevator or other traveling device, characterized by means for registration of calls and also for stopping of the traveling device automatically as each call is met, the combination with registering means to so function, of reversing means for the traveling device comprising energy storing means and also electronic means under the control of said energy storing means, said electronic means and it controlling energy storing means affording means by which an operation of said reversing means may be prearranged, and means controlling said energy storing means automatically for so perarranging an operation of said reversing means when but only when reversal of the traveling device is needed for response to a call registered by charge of said registering means.

EIVIND U. LASSEN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,827,796 Mattingly Oct. 20, 1931 1,983,940 Lewis Dec. 11, 1934 2,368,383 Seeger Jan. 30, 1945 

